5

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2025-0840

CVE-2025-0840: A vulnerability, which was classified as problematic, was found in GNU Binutils up to 2.43. This...

A vulnerability, which was classified as problematic, was found in GNU Binutils up to 2.43. This affects the function disassemble_bytes of the file binutils/objdump.c. The manipulation of the argument buf leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The complexity of an attack is rather high. The exploitability is told to be difficult. The exploit has been disclosed to the public and may be used. Upgrading to version 2.44 is able to address this issue. The identifier of the patch is baac6c221e9d69335bf41366a1c7d87d8ab2f893. It is recommended to upgrade the affected component.

(GitHub Advisory)

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CVE-2025-0840

CVE-2025-0840:

5

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

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Root Cause Analysis

The vulnerability description explicitly mentions that the disassemble_bytes function in binutils/objdump.c is affected by a stack-based buffer overflow due to manipulation of the buf argument. The provided commit patch shows that the size of the buf array within the disassemble_bytes function was changed from a fixed size of 50 to a dynamically determined size MAX_INSN_WIDTH + 1. This directly confirms that the disassemble_bytes function was vulnerable due to the fixed-size buffer. The main function was also modified to add input validation for insn_width, which is used in disassemble_bytes, but main itself is not the site of the overflow, rather it's part of the fix.

Vulnerable functions

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WAF Rule

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Reasoning

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